Import patches-unapplied version 2.8.1-2ubuntu1 to ubuntu/bionic-proposed

Imported using git-ubuntu import.

Changelog parent: 0c4cc5f31614ef87a7c585a1e765acee9b3e9991

New changelog entries:
* Merge from Debian unstable. Remaining changes:
- Build with -Werror=maybe-uninitialized when building with -O3.
- debian/patches-freetype/CVE-2018-6942.patch: re sets args array to zero
if not coords in src/truetype/ttinterp.c.
* Dropped changes, included in Debian:
- Error out on the use of the freetype-config --libtool option.
- Don't add multiarch libdirs for freetype-config --libs.
- Make libfreetype6-dev M-A: same.
- debian/rules: post-process ftconfig.h to avoid arch-dependent
definitions for multiarch, and move it back to /usr/include so that
all headers are again in the same path relative to each other.